摘要
通过观察土壤呼吸作用强度、需氧细菌总数、真菌总数、硝化作用及固氮酶活性等指标的变化,研究了新农药多噻烷的土壤生态毒性。结果表明,在实验浓度为50~750mg/kg时,土壤呼吸作用强度及异养细菌数均见增加,且与施用浓度呈正相关,可分别达到对照组的1至3倍;真菌总数在750mg/kg时略见抑制,但不出半月又复原;多噻烷对土壤硝化作用呈现抑制效应,50、250、750mg/kg抑制率分别为23.9%、34.7%、51.1%;固氮酶活性在多噻烷浓度较低时(100mg/kg)增高,为对照组的131.81%,但浓度大于300mg/kg后,就表现为抑制作用。
The effect of pesticide polythiacycloalkane on respiration,the quantities of aerobic bacteria and fungi,nitrification and N_2 fixation in an agricultural soil were investigat-ed to study the soil ecological toxicity of pesticide polythiacycloalkane.When the concentra-tions of polythiacycloalkane were used from 50 to 750mg/kg CO_2 production and the aerobic bacteria population were enhanced and the enhancement became higher with the increase of concentrations.Fungi population was reduced at higher concentration(750mg/kg),but the inhibition was temporary and restored after 14 days.Nitrification was inhibited obviously as concentration of polythiacycloalkane increased.Activity of nitrogenase was stimulated to 131.81% at lower concentration(100mg/kg)of polythiacycloalkane,but depressed when concentration of polythiacycloalkane is higher than 300mg/kg
出处
《同济医科大学学报》
CAS
CSCD
北大核心
1994年第3期184-186,共3页
Acta Universitatis Medicinae Tongji
关键词
农药
多噻烷
生态毒性
土壤
pesticide,polythiacycloalkane,ecological toxicity